[ phillips' lady ] live the regular life. phillips'. [ male announcer ] jill and her mouth have lived a great life. but she has some dental issues she's not happy about. so i introduced jill to crest pro-health for life. selected for people over 50. pro-health for life is a toothpaste that defends against tender, inflamed gums, sensitivity and weak enamel. conditions people over 50 experience. crest pro-health for life. so jill can keep living the good life. crest. life opens up when you do. >>> it's been said that mitt romney's preparations for this week's debate have taken more time than the construction of the pyramids in egypt, and according to "the new york times" he's not been focusing on policy but, instead, has been practicing zingers or snappy one-liners that he hopes will slay his opponent. as you might expect, the president appears to be ready. >> i know folks in the media are speculating already on who is going to have the best zingers. governor romney, he's a good debater. i'm just okay. >> nbc's chris tin welker